O2 Sensor Positive Current Control Circuit Open (Bank 2, Sensor 1)
The P2240 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Positive Current Control Circuit Open (Bank 2, Sensor 1). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $400 (parts and labor)
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What Are the Symptoms of P2240?
- Check Engine Light on
- Poor fuel economy
- Rough idle
- Failed emissions test
- Engine running rich or lean
What Causes P2240? (Most Likely First)
- Failed wideband O2 sensor on Bank 2 Very High
- Open circuit in the positive current control wiring High
- Corroded connector at the wideband O2 sensor Moderate
- Damaged wiring harness near exhaust components Moderate
- ECM O2 sensor control circuit failure Low
Can I Still Drive with P2240?
Short distances only. P2240 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is a positive current control circuit?
In wideband (air-fuel ratio) O2 sensors, the positive current control circuit manages the pump cell that measures the exact air-fuel ratio. An open circuit means the ECM cannot control this function.
Is P2240 related to a standard O2 sensor?
P2240 applies to wideband or air-fuel ratio sensors, which are more sophisticated than standard narrowband O2 sensors. They provide more precise air-fuel ratio information to the ECM.
Are wideband O2 sensors more expensive than standard sensors?
Yes, wideband sensors are typically more expensive, ranging from $80 to $250 for the part, compared to $30 to $80 for a standard narrowband sensor.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2240?
-
Check for open circuits in the O2 sensor positive current control wiring
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Inspect the Bank 2 Sensor 1 connector for corrosion or damage
-
Measure resistance in the pump cell circuit of the wideband sensor
-
Check the wiring harness for heat damage near the exhaust manifold
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Replace the wideband O2 sensor if internal circuits have failed
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
P2240 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P2240?
- 2008-2018 Toyota Tundra
- 2009-2019 Honda Pilot
- 2010-2020 Nissan Pathfinder
- 2011-2019 Dodge Charger V6
- 2012-2020 Ford Edge
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